Plastic composition.



thereto. In respect to traction, under cer-' .tain conditions, my improved compound will be found to be far-more efiicient. This s throughout it the desiredtsmount oftextile -fiber to produce the 'mass of new compound, it may then be sheeted or' molded'to the No Drawing BEST AVAILABLE COPY JOSEPH/B. sanroan, or sALisnUsY,connnc'rrcu'rl Y rnss'rrc comosrrxon.

Toall iohom it ma concern: I

Be it known that I, Josnrn R, SANFORD,

, a citizen, of the United States of America,

' fiber, so arrange eve residing at Salisbury,'Connecticut, .have invented a new and u'seful Plastic Composition, of which the following is a spec fication.

My invention relates to. a new and useful plastic composition applicable for use in a wide variety of connections, for example, for shoe soles, tire treads and in other articles of. manufacture requiring flexibility and at the sametime toughness, tensile strength and resistance to cuts} punctures, breaks and wear. Another object of the invention is to. produce a compound which will have the properties ofrubber and which shall be substantially cheaper and lighter than pure rubber and which.

will, in the above respects, be superior feature is one of great advantage in shoe soles and in vehicle tires.

My new compound may be made sheets, a

or molded to any desired shape and, of

course, should be vulcanized to the 'appropri'a'te degrer depending upon the partlcular use for which the compound is to be employed.

My new compound comprises a base of vulcanizable material, such as rubbery through the massof which is uniformly dis- I short lengths of textile as to cross each other 'in direction, thus imparting to the fitishe product a substantially uniform te sile strength in every direction. The best tributed 'relativeldy results are obtained by employing-a textile y cleaned Y and carded soas to remove al impurities,

fiber which has been first pro r lum s and the like, whereb a more efiective mixing of the fiber may be ad, and whereby the finished productwill possess the greatf est uniformity.

In preparing the compound, the testile fibers are worked into and throughout the mass uniformly and evenly substantially as follows: Having first selected the particular textile fiber best adapted for the particular use that the finished compound isto be ut to,'such fiber is fed into a mass of rub r that has been brought to a substantially plastic state on mixing rolls, the said textile Specification of Letters l'atent.

; mass of vulcanizable material an material added evenly "and worked into the plastic mass' by repeating diagonal and cross lap folds in the material as it is "passed through the mixing .rolls. This diagonal or cross lapping results in-the uniform distribution of .the fibers thro bout the entire mass but without regard direction, Inasmuch as fibers leadin every Patented Dec. 5, 1916. Application filed Iovcmber 27,1915. Serla11io.68,872.

izable material, as'to be efi'ectively interlocked therewithyAgain, this method of' manufacture result spin reducing any unusually long fibers to shorter 1e hs corresponding more closely to the ot er fibers in the mass. Thu the surface appearance. "of any article ma fefofsaid com mind is .hifihly-improved and-is free from um s or 6 er irregularitiesa; When the mass 0 vult cani'zable material has had distributed desired form and then vulcanized to the de siredextent.

any desire fime.

What I claim'is': v i '1. A plastic composition com rising'- a a multitude of short untwisted textile fibers, said fibers being uniformly distributed throughout the entire mass and extending in every direction therein and being interlocked therewith, and being relatively short but'of suflicient length to effectively reinforce said vulcanizablb material to increase the tensile A strength of said cdmposition in all, direcr tions. a I r 2. A plastic composition f ik'a mass of rubber and a multitude of sho ntwisted textile fibers, said fibers being formly distributed throughout the mass and extendin in eve direction min and bein inter ocke'd t erewith and ingrelative yshort but of sumci'e'nt i h to effectively reinforce said of nib r to increase the tensile strength of and com position in all directions.

3. The process of manufacturin w rubber-compound comprising, we

mass of vuleanizable material into a substantially Ylastie st ate, then feeding into said substantia ly plastic 1 88 a, multitude of untwisted textile fibers, then mixing said fibers uniformly and in all directions throughout said mass bypassing said nm with the fibers therein through mixing rolls by reterial.

JOSEPH R. SANFORD; 

